How to determine whether a character is a Chinese character in java

Java determines whether a character is a Chinese character implementation code: (Recommended: java video tutorial)

/** * 判断一个字符是否是汉字 * PS：中文汉字的编码范围：[\u4e00-\u9fa5] * * @param c 需要判断的字符 * @return 是汉字(true), 不是汉字(false) */ public static boolean isChineseChar(char c) { return String.valueOf(c).matches("[\u4e00-\u9fa5]"); }

Example:

/** * 判断一个字符是否是汉字 * * @author Yawei Xi * @date 2018-8-20 */ public class Test { public static void main(String[] args) { char a = ' '; char b = 0; char c = 'a'; char d = '中'; System.out.println(isChineseChar(a)); System.out.println(isChineseChar(b)); System.out.println(isChineseChar(c)); System.out.println(isChineseChar(d)); } /** * 判断一个字符是否是汉字 * PS：中文汉字的编码范围：[\u4e00-\u9fa5] * * @param c 需要判断的字符 * @return 是汉字(true), 不是汉字(false) */ public static boolean isChineseChar(char c) { return String.valueOf(c).matches("[\u4e00-\u9fa5]"); } }

Output result:

false false false true

Java uses Unicode encoding. The range of char type variables is 0-65535. Unsigned values can represent 65536 characters. Basically, characters on the earth can be All including

Chinese characters are basically concentrated between [19968, 40869], a total of 20901 Chinese characters

unicode encoding range:

Chinese characters: [0x4e00,0x9fa5] (or Decimal [19968,40869])

Double-byte character encoding range

1.GBK (GB2312/GB18030)

/x00-/xff GBK double-byte encoding range

/x20-/x7f ASCII

/xa1-/xff Chinese gb2312

/x80-/xff Chinese gbk

2.UTF-8 ( Unicode)

/u4e00-/u9fa5 (Chinese)

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